CITY HALL -- The first newly authorized speed cameras will be installed near schools across the five boroughs in the coming months, officials announced on Tuesday.

The city already had operational cameras at 20 locations, issuing nearly 183,000 violations so far this year.

The additional cameras will be installed at 120 new school speed zones that were approved by Gov. Andrew Cuomo and the state Legislature this year after intense lobbying from Mayor Bill de Blasio, other elected officials and traffic safety advocates.

The cameras are part of de Blasio's Vision Zero plan to eliminate traffic fatalities.

"We want to make sure everyone is safe," de Blasio said in front of P.S. 95 in the Bronx.

Cameras have been installed at three additional speed zones so far and the city hopes to have them deployed at 40 to 50 locations by the end of the year, Transportation Commissioner Polly Trottenberg said. Cameras will be operational at all 140 school speed zones over the next two years, officials said.

CHANGING LOCATIONS

Some of the speed cameras will be mobile -- attached to vehicles -- allowing the city to move them around as need dictates.

Because officials are still deciding on where to deploy all of the cameras, their locations on Staten Island and how many more will be sent to the borough have not been determined.

"We are using a system where we look at what are the most high-crash locations," Trottenberg said. DOT borough commissioners will work with the NYPD to pick the sites where officials believe there will be the most safety benefits.

The city is footing the bill for the cameras, which cost between $90,000 and $115,000 each and were already funded in the budget. The speed camera program has already netted roughly $9 million in fines for the city so far this year, Trottenberg said.

RULES FOR PLACEMENT

The Department of Transportation can put cameras within a quarter mile of a corridor that passes a school building or has a school's entrance or exit on the street. The cameras can only be active on school days, from one hour before classes start and one hour after the school day has ended. The cameras can also operate during school activities, as well as 30 minutes before and after those activities.

Some school safety zones are 15 mph, and the citywide limit will be lowered to 25 mph this fall. Violations will be issued when drivers are more than 10 mph over the posted limit.

While officials remained focused on traffic safety, Trottenberg said the city didn't want to rush installing the cameras and radar equipment. The city is also making an effort to make sure the summons are legitimate through a procedure that reviews each violation.

"We want to move as quickly as we can but we want to make sure that we're also careful and we're treating motorists fairly," Trottenberg said.